The first two settings define the state that the linked Bitbucket issue should be transitioned to when an error in Bugsnag is marked as fixed or when it is reopened.

The last two settings define the behavior when a Bitbucket issue transitions to or away from certain states.
With the default configuration a linked Bugsnag error will be marked as fixed when the Bitbucket issue is transitioned to either Resolved or Closed.
Correspondingly when a Bitbucket issue is transitioned away from Resolved or Closed to any other state, the linked Bugsnag error will be reopened.
Multiple states can be selected in both lists.